Dynomotion

Group: DynoMotion Message: 8313 From: easydigisoft Date: 9/11/2013
Subject: dip drill problem please help me.
Hello. I made good progress, I am almost finished with my retrofit CNC. I have minor problems here and there.

Why when I use G83 code for deep drill my spindle is drilling ok but when it breaks the chip it goes all the way to the safe Z not to the referent point. So it is drilling 3 mm and goes up to the save Z then going down again then drilling 3 mm and up to save Z again.

It should go down, drilling 3mm then go up to ref point for example Z0 then go down and etc etc.

What am I missing here??

Thank you.
Group: DynoMotion Message: 8319 From: Tom Kerekes Date: 9/11/2013
Subject: Re: dip drill problem please help me.
Hi easydigisoft,

I think G98/G99 change that mode.  See:


Regards
TK

Group: DynoMotion Message: 9859 From: andysontag Date: 7/26/2014
Subject: Re: dip drill problem please help me.
Hi Tom,

I experienced the same behaviour as easydigisoft when trying to do a series of G83 peck holes. Is the solution to just remove the G98 from the G83 line of code?

The sequence I'm trying to accomplish is as follows:
  1. Start at the clearance level
  2. Rapid down to the R-level
  3. Peck down Q distance
  4. Retract to the R-level
  5. repeat 3 & 4 for as many pecks as needed...
  6. When complete, retract to the clearance level (previous Z level) before moving to the next hole location
As opposed to G83 with a G98:
  1. Start at the clearance level
  2. Rapid down to the R-level
  3. Pickdown the Q distance
  4. Retract to clearance level (previous Z-level)
  5. repeat 3 & 4 for as many pecks as needed...
  6. When complete, retract to the clearance level (previous Z-level) before moving to the next hole location
For instance, would the following code achieve the desired sequence or would it simply retract to the R-level after the final peck and proceed to the next hole location without moving up to the previous clearance Z-level?

Z15
G83 X12. Y7.08 Z-29.525 R0. Q3.2 F819.

as opposed to:

Z15
G98 G83 X12. Y7.08 Z-29.525 R0. Q3.2 F819.

Andy
Group: DynoMotion Message: 9864 From: Tom Kerekes Date: 7/27/2014
Subject: Re: dip drill problem please help me.
Hi Andy,

As stated in the earlier post G98/G99 changes the "Retract Mode".

G98 sets Retract Mode to to "old Z"

G99 sets Retract Mode to "R plane"

I think the better approach is to specify the mode you want rather than leaving out the one you don't.

HTH
Regards
TH

Group: DynoMotion Message: 9873 From: Andy Sontag Date: 7/28/2014
Subject: Re: dip drill problem please help me.
Ok, will do. 

Turns out the problem is probably due to the way our CAM software is preparing the code for each hole. Instead of creating a new G83 line for each hole, it was just changing the X&Y location which doesn't appear to allow for the possibility of both retracting to the R-level between pecks and retracting to the previous Z-level between holes. 

The solution for me was to create a new operation for each hole needing a peck routine instead of selecting all of the holes in one operation. I also needed to manually add a G0 between operations although an edit to our post processor file should fix that.

Andy


On Sun, Jul 27, 2014 at 6:49 AM, Tom Kerekes tk@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:
 

Hi Andy,

As stated in the earlier post G98/G99 changes the "Retract Mode".

G98 sets Retract Mode to to "old Z"

G99 sets Retract Mode to "R plane"

I think the better approach is to specify the mode you want rather than leaving out the one you don't.

HTH
Regards
TH